Other World Computing has announced the release of their Mercury Helios PCIe Thunderbolt Expansion Chassis, a new device that gives users of Thunderbolt port equipped computers like the Mac mini, iMac, and MacBook the ability to tap into a wide variety of professional-level performance PCIe adapters. We're talking about any half-length PCIe 2.0 card up to 6.5" inches long. PCIe cards for video capture/editing, media transcoding, audio processing, data storage and more. The Mercury Helios PCIe Thunderbolt Expansion Chassis will be available starting next week for $379.99.